Improvement in stove-pipe drums



PATENT OFFICE.

BENJAIVIIN WEBSTER, OF KINGFIELD, MAINE.

IMPROVEMENT IN STOVE-PIPE DRUMS.

Specification forming part of LettersPatent No. 116,900, dated July 11, 1871.

To all lwhom it may concern:

Be it known that I, BENJAMIN WEBSTER, of

vforming part of this specification, in which- Figure'l represents a vertical longitudinal section of a stove-pipe provided with my improved attachment7 the line x w, Fig. 2, indicating the plane of section. Fig. 2 is a plan or end view of the same.

Similar letters ofreference indicate corresponding parts.

My invention consists in improving that class of airheaters placed inside of a stove-pipe, as hereinafter fully described and subsequently pointed out in the claim.

A in the drawing represents a section ofV stovepipe. WVithin the saine is suspended a hollow inverted cone, B,.of suitable length, its large upper end being of such size that around it sufficient space, a, is left for the escape of smoke. To the lower end of the cone lead transverse pipes b b,

which communicate with the outer air to conduc cold air into the cone. Larger-pipes, c c, extend from the upper part of the cone to and through the sides ofthe pipe A, to convey the heated air from the cone to the room. The air entering the cone through the pipes b becomes heated by the products of combustion which surround the cone, and escapes in such heated state through the pipes c. An air-circulation is thus provided which does not add to the expense of heating, but greatly augments the eifects of such process. C C are two semicircular dampers, arranged with their diametrical pivots d d close together above the cone B, so that they can be used for opening or closing the smoke-space a, as specified.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The air-heating chamber shaped inthe form of an inverted cone, the small cold-air-inlet pipes b near the apex, the larger hot-air-outlet pipes near the base, and the double damper C O over the top, all combined, constructed, and arranged in a stove-pipe, as and for the purpose specified.

BENJAMIN WEBSTER. Witnesses:

BENJN. B. MACE, JAMES H. DODGE. 

